EP2791926B1 - Leitungsendenkondensator zur messung einer verdrahtungsimpedanz von notrufanzeigeschaltungen - Google Patents

Leitungsendenkondensator zur messung einer verdrahtungsimpedanz von notrufanzeigeschaltungen Download PDF

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Publication number
EP2791926B1
EP2791926B1 EP12788389.0A EP12788389A EP2791926B1 EP 2791926 B1 EP2791926 B1 EP 2791926B1 EP 12788389 A EP12788389 A EP 12788389A EP 2791926 B1 EP2791926 B1 EP 2791926B1
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EP
European Patent Office
Prior art keywords
capacitor
reference resistor
resistor
wiring impedance
voltage
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Application number
EP12788389.0A
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English (en)
French (fr)
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EP2791926A1 (de
Inventor
Galera Andres CORDOBA
William Edwards
Joseph Peter CALINSKI
Donald Becker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Fire and Security Americas Corp
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UTC Fire and Security Americas Corp Inc
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/12—Checking intermittently signalling or alarm systems
    • G08B29/123—Checking intermittently signalling or alarm systems of line circuits
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults

Definitions

  • the present invention relates to testing emergency notification circuits, and specifically to a system and method for testing the wiring impedance of emergency notification circuits using an end-of-line capacitor.
  • Emergency notification circuits provide power to a plurality of notification devices such as sirens and strobe lights. These devices are used to alert persons in the area of an emergency condition. Therefore, it is necessary to ensure the continuous functionality of these devices.
  • Each notification device requires a working voltage and current to operate.
  • the wires that provide the voltage and current to the devices have an impedance themselves, if a condition occurs which causes the wiring impedance to change, such as a short circuit or open circuit condition, the notification devices may not receive the proper working voltage and current. It is therefore necessary to monitor the wiring impedance of the emergency notification circuit in order to ensure continuous operation of every notification device.
  • a system and method includes an end-of-line capacitor, an emergency notification circuit, a plurality of notification devices, a reference resistor, and a controller.
  • the plurality of notification devices are connected in parallel, with the end-of-line capacitor.
  • the capacitor is discharged through the reference resistor.
  • the controller is configured to determine the wiring impedance of the emergency notification circuit during discharge of the capacitor by monitoring voltage across the reference resistor.
  • the present invention involves monitoring the impedance of a notification appliance circuit (NAC), and in particular a system and method for monitoring the impedance of a NAC using an end-of-line capacitor.
  • the system includes a capacitor, a controller, and a NAC used to power a plurality of notification devices, such as sirens or strobe lights.
  • the capacitor is connected in parallel with the plurality of notification devices and is charged and discharged in order to determine the wiring impedance of the NAC.
  • a controller monitors the voltage across a reference resistor during discharge of the capacitor in order to determine the wiring impedance of the NAC based upon the RC time constant of the discharge circuit.
  • FIG. 1 is a block diagram illustrating a system 10 for monitoring a wiring impedance 16 of a NAC 12.
  • the system includes a plurality of notification devices 14a-14n, capacitor 18, switches 20a-20b, system diodes 22a-22b, reference resistors 24a-24d, controller 26, voltage source 28, amplifier 30, appliance diodes 32a-32n, and analog-to-digital converter 34.
  • Wiring impedance 16 is illustrated schematically as a resistor, but represents the entire distributed wiring impedance of NAC 12. Values of capacitor 18, and resistors 24a-24d are known at the time of installation of system 10.
  • Controller 26 is capable of several functions, one of which is determining wiring impedance 16. Controller 26 may be incorporated in a main system controller, or may be a separate controller located, for example, within a power supply used to supply power to NAC 12. Controller 26 may comprise a digital microprocessor with a memory. Analog-to-digital converter 34 provides input to controller 26. If controller 26 determines there is a fault based upon the determined value of wiring impedance 16, controller 26 may, for example, send an output to the main system controller. The main system controller will then provide an output indicating the detected fault. This output may comprise any form of output, such as illuminating an LED, or providing an indication on a display.
  • Emergency notification circuit 12 provides power to the plurality of notification devices 14a-14n.
  • switches 20a-20b are both closed such that appliance diodes 32a-32n are forward biased, and thus, notification devices 14a-14n are turned on.
  • Switches 20a-20b may be, for example, mechanical switches, or solid-state switches such as metal-oxide-semiconductor field-effect transistors (MOSFETs). Switches 20a-20b may be controlled in several different ways, for example, by controller 26, or by a main emergency system controller.
  • Notification devices 14a-14n may be any devices used for emergency notification such as sirens or strobe lights.
  • Voltage source 28 is any source that provides a DC voltage.
  • switches 20a-20b are open. This reverses the voltage across notification devices 14a-14n which ensures that appliance diodes 32a-32n are reverse biased and thus, none of notification devices 14a-14n are turned on.
  • capacitor 18 is charged by current from voltage source 28, through resistor 24a, capacitor 18, wiring impedance 16, and resistors 24b-24c.
  • controller 26 may determine the capacitance of capacitor 18. Although the nominal capacitance of capacitor 18 is specified at installation time of the circuit, the value of capacitance may be fine-tuned to obtain a more specific value.
  • controller 26 monitors the voltage across resistor 24c. By monitoring the voltage across resistor 24c over time, controller 26 can determine the time constant of the circuit involving capacitor 18, resistors 24a-24c, and wiring impedance 16. Because resistors 24a-24c are known, and the value of wiring impedance 16 is very small compared to that of resistors 24a-24c, the capacitance of capacitor 18 may be calculated based on the determined time constant. This calculation may be done, for example, by using a pre-programmed look-up table in controller 26 to obtain a capacitance based upon the measured time constant.
  • Wiring impedance 16 is then determined by discharging capacitor 18.
  • Switch 20b is closed and switch 20a remains open in order to discharge capacitor 18.
  • system diode 22a is forward biased due to the orientation of charge of capacitor 18. Therefore, capacitor 18 is discharged through wiring impedance 16 and resistor 24d.
  • Resistor 24d has a very small resistance, typically much smaller than that of wiring impedance 16. Because the resistance of resistor 24d is small, the voltage across resistor 24d is amplified for controller 26 by amplifier 30.
  • Controller 26 determines the value of wiring impedance 16 based upon the amplified voltage across resistor 24d. While capacitor 18 is discharging, controller 26 may measure the decay voltage across resistor 24d. By monitoring this voltage over time, controller 26 may determine the RC time constant of the discharge circuit which includes system diode 22a, capacitor 18, wiring impedance 16, and resistor 24d. Because values for system diode 22a, capacitor 18, and resistor 24d are known, controller 26 may calculate the value of wiring impedance 16 based upon the measured RC time constant. This calculation may be done, for example, by using a pre-programmed look-up table to obtain a wiring impedance based upon the measured time constant.
  • the system may charge and discharge capacitor 18 on a regular basis in order to monitor wiring impedance 16 over time. For example, some regulations may require that a problem with wiring impedance 16 be detected within 90 seconds of the problem occurring. In this case, capacitor 18 may be charged and discharged every 30 seconds. Controller 26 could then alert a main emergency system controller of a wiring impedance condition after detecting the same condition two charge/discharge cycles in a row. The main emergency system controller may then alert a technician so that the problem may be fixed.
  • FIG. 2 is a flow chart illustrating a method 60 according to an embodiment of the present invention.
  • the system opens both switches 20a-20b in order to charge capacitor 18.
  • the system measures the voltage across resistor 24c in order to determine an RC time constant of the charge circuit.
  • system 10 fine-tunes the value of capacitance of capacitor 18 based upon the measured RC time constant.
  • system 10 closes switch 20b in order to discharge capacitor 18.
  • controller 26 measures the voltage across resistor 24d in order to determine an RC time constant of the discharge circuit.
  • controller 26 uses the measured RC time constant for the discharge circuit to determine the wiring impedance of the NAC circuit.
  • the present invention describes a system and method for monitoring the wiring impedance of an emergency notification circuit.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Claims (6)

  1. System (10) zur Messung einer Verdrahtungsimpedanz (16) in einer Notfallmeldeschaltung (12), wobei das System (10) Folgendes umfasst:
    einen Leitungsende-Kondensator (18);
    eine Vielzahl von Meldeeinrichtungen (14a - 14n), die parallel mit dem Kondensator (18) geschaltet sind;
    einen ersten Referenzwiderstand (24c);
    einen zweiten Referenzwiderstand (24d), durch den der Kondensator (18) entladen darf; und
    eine Steuerung (26), konfiguriert,
    um erste und zweite Schalter (20a - 20b) zu öffnen, die zwischen einer Spannungsquelle (28) und der Steuerung (26) angeordnet sind, und um den Kondensator (18) durch Strom aus der Spannungsquelle (28), durch einen Widerstand (24a), durch die Verdrahtungsimpedanz (16), durch den Kondensator (18), durch einen weiteren Widerstand (24b) und durch den ersten Referenzwiderstand (24c) zu laden;
    um, während des Aufladens des Kondensators (18), die Kapazität des Kondensators (18) zu bestimmen durch Überwachen der Spannung über den ersten Referenzwiderstand (24c), durch Bestimmen der Zeitkonstante des Kondensators (18), des Widerstands (24a), des weiteren Widerstands (24b), des ersten Referenzwiderstands (24c) und der Verdrahtungsimpedanz (16), wobei die Widerstände (24a - 24c) bekannt sind und wobei der Wert der Verdrahtungsimpedanz (16) klein ist im Vergleich zu dem der Widerstände (24a - 24c);
    um eine RC-Zeitkonstante einer Entladeschaltung zu bestimmen, die eine Systemdiode (22a), den Kondensator (18), die Verdrahtungsimpedanz (16) und den zweiten Referenzwiderstand (24d) beinhaltet, auf Grundlage der überwachten Spannung über den zweiten Referenzwiderstand (24d) während des Entladens des Kondensators (18), wobei der zweite Schalter (20b) geschlossen ist und der erste Schalter (20a) geöffnet bleibt, um den Kondensator (18) zu entladen, wobei R eine Summe des Widerstands des zweiten Referenzwiderstands (24d) und der Verdrahtungsimpedanz (16) ist und C die Kapazität des Kondensators (18) ist; und
    um die Verdrahtungsimpedanz (16) der Notfallmeldeschaltung (12) zu bestimmen, als Reaktion auf die RC-Zeitkonstante, wobei die Werte für die Systemdiode (22a), den Kondensator (18) und den zweiten Referenzwiderstand (24d) bekannt sind.
  2. System nach Anspruch 1, wobei das System weiter Folgendes umfasst:
    einen Analog-Digital-Wandler (34) zum Wandeln der Spannung über den Referenzwiderstand (24d) in eine digitale Darstellung; und
    wobei die Steuerung (34) einen digitalen Mikroprozessor umfasst und die Spannung über den Referenzwiderstand (24d) überwacht durch Verwenden der digitalen Darstellung von dem Analog-Digital-Wandler (34).
  3. System nach Anspruch 1, wobei das System weiter einen Verstärker (30) umfasst, zum Verstärken der Spannung über den Referenzwiderstand (24d) während der Entladung des Kondensators (18).
  4. System nach Anspruch 1, wobei, wenn sowohl der erste Schalter (20a) als auch der zweite Schalter (20b) sich in einem geschlossenen Zustand befinden, die Vielzahl von Meldeeinrichtungen (14a - 14n) Strom erhalten.
  5. Verfahren zur Messung einer Verdrahtungsimpedanz (16) einer Notfallmeldeschaltung (12), wobei das Verfahren Folgendes umfasst:
    Öffnen der ersten und zweiten Schalter (20a - 20b), die zwischen einer Spannungsquelle (28) und einer Steuerung (26) angeordnet sind, und Laden eines Leitungsende-Kondensators (18), der mit der Notfallmeldeschaltung (12) parallel zu einer Vielzahl von Meldeeinrichtungen (14a - 14n) verbunden ist, durch Strom von der Spannungsquelle (28), durch einen Widerstand (24a), durch die Verdrahtungsimpedanz (16), durch den Kondensator (18), durch einen weiteren Widerstand (24b) und durch einen ersten Referenzwiderstand (24c);
    Bestimmen, während des Aufladens des Kondensators (18), der Kapazität des Kondensators (18) durch Überwachen der Spannung über den ersten Referenzwiderstand (24c), durch Bestimmen der Zeitkonstante des Kondensators (18), des Widerstands (24a), des weiteren Widerstands (24b), des ersten Referenzwiderstands (24c) und der Verdrahtungsimpedanz (16), wobei die Widerstände (24a - 24c) bekannt sind und der Wert der Verdrahtungsimpedanz (16) klein ist im Vergleich zu dem der Widerstände (24a - 24c) ;
    Entladen des Kondensators (18), wobei der zweite Schalter (20b) geschlossen ist und der erste Schalter (20a) geöffnet bleibt, und Überwachen der Spannung über einen zweiten Referenzwiderstand (24d), durch den der Kondensator (18) entladen darf, während der Kondensator entlädt (18), und Bestimmen einer RC-Zeitkonstante einer Entladeschaltung, die eine Systemdiode (22a), den Kondensator (18), die Verdrahtungsimpedanz (16) und den zweiten Referenzwiderstand (24d) beinhaltet, auf Grundlage der überwachten Spannung über den zweiten Referenzwiderstand (24d), wobei R eine Summe des Widerstands des zweiten Referenzwiderstands (24d) und der Verdrahtungsimpedanz (16) ist und C die Kapazität des Kondensators (18) ist; und
    Bestimmen der Verdrahtungsimpedanz (16) der Notfallmeldeschaltung (12) als Reaktion auf die RC-Zeitkonstante, wobei die Werte für die Systemdiode (22a), den Kondensator (18) und den zweiten Referenzwiderstand (24d) bekannt sind.
  6. Verfahren nach Anspruch 5, wobei das Bestimmen der Impedanz der Notfallmeldeschaltung (10) des Weiteren die Verstärkung der Spannung über den ersten Referenzwiderstand (24d) umfasst.
EP12788389.0A 2011-12-12 2012-11-02 Leitungsendenkondensator zur messung einer verdrahtungsimpedanz von notrufanzeigeschaltungen Active EP2791926B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/323,522 US8878552B2 (en) 2011-12-12 2011-12-12 End-of-line capacitor for measuring wiring impedance of emergency notification circuits
PCT/US2012/063176 WO2013089932A1 (en) 2011-12-12 2012-11-02 End-of line capacitor for measuring wiring impedance of emergency notification circuits

Publications (2)

Publication Number Publication Date
EP2791926A1 EP2791926A1 (de) 2014-10-22
EP2791926B1 true EP2791926B1 (de) 2019-01-02

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EP12788389.0A Active EP2791926B1 (de) 2011-12-12 2012-11-02 Leitungsendenkondensator zur messung einer verdrahtungsimpedanz von notrufanzeigeschaltungen

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US (1) US8878552B2 (de)
EP (1) EP2791926B1 (de)
ES (1) ES2717952T3 (de)
WO (1) WO2013089932A1 (de)

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US11670932B2 (en) 2020-05-21 2023-06-06 Carrier Corporation Short circuit isolator

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CN104897967B (zh) * 2014-03-04 2019-02-01 西门子瑞士有限公司 火警系统的现场连线检测装置及方法
US10762770B1 (en) 2019-05-24 2020-09-01 Honeywell International Inc. Detecting faults on a spur wired alarm circuit
US10977929B2 (en) * 2019-05-24 2021-04-13 Honeywell International Inc. Detecting faults on a spur wired alarm circuit
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Also Published As

Publication number Publication date
ES2717952T3 (es) 2019-06-26
WO2013089932A1 (en) 2013-06-20
EP2791926A1 (de) 2014-10-22
US20130147495A1 (en) 2013-06-13
US8878552B2 (en) 2014-11-04

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